Everything I've read (and this is much hearsay, considering Nokia never released information about the N9) leads me to believe that Maemo6 will be a slightly repackaged Maemo5, and definitely will not be Meego-compatible. Now, Microsoft would certainly love it if Nokia were to market Maemo6 as a "kind of Meego", since that would destroy Meego's credibility and greatly damage Linux mindshare. But I don't think it will ever happen, not even Microsoft is that evil.
[...]2. Keeping Nokia on track to deliver necessary software updates following launch of the product.[...]
[...]I keep feeling amazed every time somebody says "Harmattan is not MeeGo" based on some architecture differences and then continues "Harmattan is Maemo" based on... what? No Fremantle UX, no Hildon and no GNOME-style API means a totally different story for most Maemo users and developers. Leave alone all the middleware pieces that were rewritten from Fremantle to Harmattan and happen to be the same or quite close to MeeGo. Sorry, but I don't buy that. If you insist that Harmattan is not MeeGo then you need to be consequent and reckon that Harmattan is not Maemo either. And once you are there please ask yourself how useful was for you and for the [LinuxMobile+Qt] community to stress the exceptions instead of the commonalities.[...]